Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1998-11-02
1999-12-07
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175427, E21B 1058
Patent
active
059967153
ABSTRACT:
A rotary roof mine bit for drilling holes in the roof of a mine, comprises a bit body and an insert mounted in the bit body. The insert is formed of a hard material such as carbide or diamond. A top surface of the insert comprises two top sections which intersect a respective main surface of the insert to define first and second non-linear cutting edge. In one embodiment each cutting edge comprises a plurality of mutually angled segments. In another embodiment each cutting edge is continuously curved. Preferably an axial notch is disposed at a center of the top surface.
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Andersson Jan Magnus
McCloskey David Alexander
Peay Kent
Dang Hoang C.
Sandvik Rock Tools, Inc.
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